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Trig Identities
sin(2x)
2sin(x)cos(x)
cos(2x)
cos2x - sin2x
2cos2x - 1
1 - 2sin2x
tan(2x)
2tanx / 1-tan2x
sin(A+B)
sin(A)cos(B) + sin(B)cos(A)
sin(A-B)
sin(A)cos(B) - cos(A)sin(B)
cos(A+B)
cos(A)cos(B) - sin(A)sin(B)
cos(A-B)
cos(A)cos(B) + sin(A)sin(B)
tan(A+B)
tanA + tanB / 1 - tanAtanB
tan(A-B)
tanA - tanB / 1 + tanAtanB
sin2x
1 - cos(2x) / 2
cos2x
1 + cos(2x) / 2
tan2x
1 - cos(2x) / 1 + cos(2x)
sin(x/2), cos(x/2), tan(x/2)
Square roots of their sin2x, cos2x, and tan2x versions without cos(2x)
sinAcosB
½ [ sin(A+B) + sin(A-B) ]
cosAcosB
½ [ cos(A+B) + cos(A-B) ]
sinAsinB
½ [ cos(A-B) - cos(A+B) ]
secx and tanx Identity
tan2x + 1 = sec2x
sinx and cosx Identity
sin2x + cos2x = 1
cotx and cscx Identity
cot2x + 1 = csc2x
∫tanx dx
ln |secx|
∫secx dx
ln |secx + tanx|
∫cscx dx
ln |cscx - cotx|
∫cotx dx
ln |sinx|
√x2 - a2
x = asecθ
√x2 + a2
x = atanθ
√a2 - x2
x = asinθ
∫sec2x dx
tanx
∫csc2x dx
-cotx
∫secxtanx dx
secx
∫cscxcotx dx
-cscx
d/dx (sin-1x)
1 / √1-x2
d/dx (cos-1x)
-1 / √1-x2
d/dx tan-1x
1 / 1+x2